Rotary steam or fluid motor



Dec. 4, 1934.

S. C, CARTER ET AL ROTARY STEAM OR FLUID MOTOR Filed Aug 28, 1955 3 Sheets-SheerJ l DeC- 4, 1934- s1 c. CARTER ET AL ROTARY STEAM OR FLUID MOTOR S, 19 5 Sheets-Sheet 2 Filed -Agj Si@ g We?? 19A/00nd Dec. 4, 1934. s. c. CARTER ET A'. 1,983,216

`ROTARY STEAM OR FLUID MOTOR Filed Aug. 23, 1933 5 Sheets-Sheet 3 @ff www Patented Dec. 4, 1934 PATENT OFFICE 1,983,216 "ROTARY STEAM on FLUID `Moron Samuel C.

Carter and Frank H.

Metke,

Glendale, Calif. i

esplicita@ AAugust 2s, 1933, semi No, 687,135 3 s claims. .(01.121-11) n rIhis invention relatesto a steam or fluid driven engine or motor, andit is a general object of the invention to provide a simple, practical andefficientmotor of this character.

Another object of vthe invention is, t0 D I'Ovide an improved fluid motor or engine,that initially directly develops rotary power and therefore produces little or no` vibration. y

Another object of the invention is toy provide an improved motor capable `of being operated or driven by steam or iothersuitable vaporor fluid under pressure. y i

i Another object of the invention is ,to provide an engine or fluidpmotor that does notginclude any large orheavy reciprocated parts.M The elements ofthe motor provided by the invention that are acted upon or that receive thel driving force of the `actuating steam or fluid pressure are rotatable and have` direct operative connections with the shaft` of the engine.

Another object of the invention is `to provide `a steam or fluid motor that includestwo rotatable members or motors that are driven or acted upon by the `actuating fluid under pressure for the major vportions of their strokes or revolutions. It is another object of the invention to provide a steam or fluid motor of the character mentioned thatiis easy to regulate and `control and that may readily reverse to drive the1 engine shaft in the counter-clockwise directionas well as in the forwarder clock-wise direction.

Itis another object of the inventionto provide `a steam or fluid motor that develops substantially constant or unvarying continuous .power and therefore `may not require a fly wheel. Another` object of the invention is to provide a steam or fluid motor of `the `characterV mentioned that is compact and entirely self-conftained. t y l Otherobjects and features of the inventionwill be better and vfully understood fromthe following detailed description of a typical form and application of the invention, throughout which description reference is had to the accompanying drawings, in which: i Fig. 1 is a side elevation of the motor proL vided `by the presentinvention showing a p0rtion of the valve gear housing. broken away to illustrate the principal parts of the valve gear in elevation. Fig. `2 is a longitudinal vertical `detailedsectional View taken substantially4 as indicated by lline` 2f2 on Fig. 3,. Fig. 3 is atransverse vertical detailed sectional view taken as incheated by im@ 3 3 onr'igz; Fig; 41s detailed sectional view of the timing gears, being a Aview taken substantially as indicated by line 4`4 on Fig. 3,` and Fig. 51s an enlarged transverse detailed sectional `View taken substantially as indi- .cated by line 5-5 on Fig. 2.

'The present invention is capable of embodiment in forms for various purposes and for various installations, and is capable of efficient operation when driven by practically any class of fluid under pressure, however it is particularly adapted for operation by steam or other vapors. In the .following detailed description, we will disclose a typical form of the invention, it being understood that the invention is not to be considered as limited or restricted to the specific construction about to be described or to the operation of the motor by any specific kind or class of fluid. The engine or fluid motor provided by the presentinvention includes generally, a body or block 10 having two bores or chambers, 11, rotatably driving members or driving rotors 12 in the chambers 11, a master rotor 13 at the axis of the engine engaging the driving rotors 12, reversing valves 14, control valves 15, and a valve gear 16 for operating thecontrol valves l5.

` The body or block 10 of the motor may be varied considerably in shape, construction, etc., depending on the size, use or installation of the motor. In the particular embodiment illustrated, the block 10 is an elongate horizontally disposed member of rectangular cross section. The block 10 may be supported on `suitable legs or mounting brackets 17, it being understood that the block 10 may be arranged in any position and mounted in any suitable or practical manner. The chambers 11 in which the driving rotors 12 operate extend horizontally and transversely through the block 1,0 from one side to the other. The chambers 11 aret preferably of the same diameter and length, and are round in cross section and uniform in diameter throughout their lengths. In accord ance-with ,thelinventiom the chambers 11 are spaced apart, being located adjacent tothe ends of theblock 10. A central chamber or bore 18 extends transversely through the block 1() from one side to the other to carry the master rotor 13. The central bore 18 is preferably smaller in diameter than the chambers 11 and its opposite sides joinor communicate with the chambers 11.` Side plates 19 are suitably bolted to the opposite sides of the block 10 and extend over the ends of the chambers 11 and bore 18. The side plates 19 are `provided with openings 20 concentric with the chambers and bore for carrying bearing housings 37.` i

`'lhe driving members or driving rotors 12 are rotatable in the chambers 11 and are adapted t0 be acted upon or directly rotated by the actuating uid pressure. The rotors 12 are cylindrical in configuration and are considerably smaller in diameter than the bores or chambers 11 so that they are surrounded by annular fluid receiving spaces. The peripheries of the rotors 12 are accurately and smoothly finished to. cooperate with the master rotor 13 as will be subsequently described. Peripheral grooves 21 are provided inm the opposite ends of the rotors 12 for carrying wear rings 22 of cast iron or the like.

driving rotors 12 are carried by the shafts23 and are keyed thereto at 122. Recesses 24 are pro-I vided in the opposite ends of the rotors 12 around the shafts 23 to receive the inner portions of ybear;y

ing housings 25. The bearing housings 25 carry packing means or glands 26 for sealing about the shafts 23. The glands 26vprevent any'condensation from reaching the bearing and prevent steam leaks around the shaft. The shafts 23 are shoul-y dered at 23a and anti-friction bearings 27 are provided around the shouldered portions of the shafts to support the shafts in the mountings 25. Bearing retainers or caps 28 are attached to and close the outer sides of the bearing housings 25. The shafts 23 of the driving rotors 12 extend through openings in the caps 2 8 and are packed about by packing 29.

In accordance with the invention, each of the driving rotors 12 is provided with a tooth or vane 30. The vanes 30 extend axially of the rotors 12 and project from their peripheries to operate in the annular or open portions of the chambers 11. Dove tailed or undercut axial grooves 3 1 are provided in the peripheries of the driving rotors 12 and extend through the wear rings 22. The base portions of the vanes 30 have inwardly divergent sides 3OfL to fit in or cooperate with the grooves 31 to lock the vanes in position. The driving vanes 30 are adapted to be acted upon by or receive the driving energy of the actuating steam or uid under pressure and extend between the opposite ends of the chambers 11. In the preferred construction, the vanes 30 have cross sectional configurations similar to involute spur gear teeth, having curved or convexed side faces 32. The tops or outer ends 33 of the vanes 30 may clear the walls of the chambers 11 with but very slight clearance so that they do not actually contact with the chamber walls and are not subjected to wear, however it may be preferred to have outer ends 33 of the driving vanes in effective sliding engagement with the walls of the chambers as illustrated in the drawings. The driving teeth or driving vanes 30 arepreferably hardened. f y

The master rotor 13 rotates in the central bore 18 and cooperates with the two driving rotors 12. The master rotor 13 is a cylindrical member whose periphery closely or accurately nts the bore 18 without actually engaging the walls of the bore. The master rotor` 13 has rolling engagement with the peripheries of the driving rotors 12. f .Peripheral grooves 34 areprovided in the opposite ends of the master rotor 13 to carry wear rings 35 which bear against or engage the end plates. The central or master rotor 13. extends from one end to the other of the bore 18v to completely occupy o r fill the bore. The engagement of the* master rotor 13 with the driving rotors yl2 and the coe operation of the vanes`30 with the walls of the The rings 22 are pressed in the grooves 21 andare adaptedy .Y to bear against or have engagement'withl 'the in?" ner sides of the hardened sideplates 19. :The-

chambers 11 divides each of the annular spaces in the chambers into two distinct portions, namely, a high pressure portion at the rear of the vane relative to its direction of rotation, and a low pressure or exhaust portion in front of the vane. A longitudinal or axial groove 34a is provided in the periphery of the master rotor 13 and extends through the wear rings 35 to the end walls of the bore 18. The movement of the rotors 12 and 13 is related or synchronized so that the groove 34EL successively or alternately receives the vanes 30. The groove 34a is shaped to eifectively receive the driving vvanes 30 without contacting with the surfaces of thelvahes.

1 The master rotor 13 is carried by a central shaft 35 and is provided at its opposite end with central recesses `36. The rotor 13 is keyed to the shaft 1at' 35".' Bearing housings 37 are attached to the side plates 19 and have reduced inner portions extending into the recesses 36. Packing glands 38 are carried by the bearing housings 3'7 to seal about the shaft 35a. Suitable ball bearings 39 are provided inthe housings 37 te carry the shaft 35a for free rotation. Bearing retaining plates or caps 40 close the outer ends of the bearing housings 3'7. The shaft 35a of the master rotor 13 extends through an opening in one of the caps 40 to project from a side of the engine to form the engine shaft.

An operative connection is provided between the shafts 23 and the shaft 35a to synchronize the movement of the driving rotors 12 with the movement of the master rotor 13 and to form an operative drive between the driving rotors of the engine shaft 35a. This timing and driving connection may be in the nature of a gear connection including a gear 4l on the projecting end of each shaft 23, meshing or cooperating with a gear 42 on the central or engine shaft 35a. The gears 4l and the gear 42 are related to provide for the proper synchronism of the rotors 12 and the rotor 13. In the particular case illustrated in the drawings, the gears 41 and the gear 42 are of the same effective diameters. A suitable gear case 43 `is carried by the caps 28 and 40 to enclose the gears 41 and 42. As clearly illustrated in Fig. 2 of the drawings, the driving rotors 12 are related so that their vanes 30 are in the same or corresponding rotative positions, and as the gears 41 cooperate with the common or central gear 42, L, r

the driving rotors 12 are maintained in this particular relation.

Passages or ports are provided in the block 10 to carry the actuating steam or fluid pressure to the chambers 11, and to carry the steam or liuid exhausted from the chambers. In accordance with the invention, two parts communicate with each chamber 11 at circumferentially spaced points. Ports 44 are provided in the block 10 to communicate with the chambers 11 at points spaced at opposite sides of the juncture of the bore 18 with the chambers. The ports 44 extend through vthe block 10 to its upper and lower ends, the 'upper ends of the ports 44 of the respective chambers 11 being relatively close together as clearly illustrated in Fig. 2 of the drawings. The vports 44 communicate with the chambers 11 at points spaced substantially 90 apart. Exhaust ports 45 extend horizontally or transversely into therblock 10 adjacent its upper and lower ends and are spaced between the ports 44. The fiow through the ports v44 and 45 is governed or controlled bythe reversing valves 14 and the control 'valves '15,.and as the 'reversing valves 14 are spaced between'the control 'val'v'es l5 and the ports in Ato 15 are carried by valve chests" 46 `arranged on the upper and lower sides of the rotor block 10.

A reversing valve 14 is provided in each valve chest 46,` and each valve 14 includes a body or plug 47 rotatable in a transverse opening 48 in` a valvechest. The plugs 47 and the openings 48 are longitudinally tapered, and the opposite ends of the plugs project from the opposite sides of the valve chests." Two ports 49 are provided in each valve chest 46andexten'd from the outer` ends of the ports 44 tothe opening 48. The ports 49 communicate with the opening 48 at substantially diametrically opposite points. Each valve chest "46 has an exhaust port 50 extending from the opening 48 to a port 45. The exhaust ports 50 join the openings 48 atpoints `spaced between the ports 49. A pressure port or inlet port 51 is provided in each valve chest `46 and extends between a control valve 15 and the opening 48 of a reversing valve. The inlet ports 5l are diametrically opposite the exhaust ports `50. Two curved passages 52 are provided in each plug 48. The opposite ends of the passages 52 extend to the periphery of the plugs 48 and are spaced substantially 907 apart.` It will be ap' parent howeachreversingV plug 48 may be positioned to have one of itspassages 52 connecting a port 49 with an inlet port 51 and has its other passage 52 connecting a port 49 with an exhaust port 50. The plugs 48 are adapted to be turned to connect either one of the ports 49 with either the `inlet' port 51 or the outlet port 50, and in 4this manner, the admission of actuating fluid or steam to the chambers 11 and thedischarge from the chambers maybegoverned to provide for the `driving of the rotors 11` in either direction. In accordance with the invention, an operative `inter-connection is provided between the two reversing valves 14 whereby they may be simultaneously operated to reverse the iow through the motor and thus reverse the direction of rotation of the rotors 12; The large projecting ends of the reversing plugs 47 carry sprockets 53. A chain 54 passesover the sprockets 53to `opera.- tively connect the plugs 47v of the two reversing valves. videdon the projecting `end of the upper reversing plug 47. The plugs 470i the two reversing valves 14 are related and positioned so that one port 44 of each chamber 11 is in communication with an inlet port 51 and the other port 44 of the chamber is in communication with an outlet port 50. Further, the reversing valves 14 are related so that one ofy the upper ports44 is in communication with an exhaust port 45 and the other upper port 44 is in communication with an exhaust port `45, while one of the lower ports 44 is 'incommunication with an exhaust port and the `other lowerport 44 is in communication with the lower inlet port 51. In this manner, each chamber `11 `hasone of itsvports 44 operating as an inlet port and its other port 44 operating as an exhaust port. In the particular positioning of the valve illustrated throughout the drawings, the

` reversing plugs 47 are positioned so that the driving rotors 12 are rotated in the direction indicated by the arrows inFig. 2, which of course, causes the master rotor 13 to be driven or rotated `in the opposite direction.

The control valves 15 are provided to govern the admissionof the actuating steam` or fluid A suitable operating lever 55 is pro-` pressure to the chambers'll; the'particuiar form of the invention illustrated in the drawings, the control valves'15 are in the nature of `piston valves carried by the' valve chests 46. i Each control valve 15"includes a piston or valve proper 55 adapted to reciprocate in a cylinder 56. The ports 51 communicate with the cylinders 56 at points spaced between the ends ot the cylinders. Steam or fluid pressure supply lines or ports 57 dischargeinto the cylinders 56 at` points spaced between the ends of the cylinders.` Steam or fluid pressure supply lines or ports 57 discharge into the cylinders 56 at points midway between their ends. The pistons or valves 55 are provided with annular grooves or ports 58 adapted to simultaneously register with the ends of the ports 51 and 57 to admit the `actuating steam or fluid pressure to the chambers 1l. In the particular relation of parts illustrated, the valve ports. 58 are comparatively wide to remain in `cornn'lunication with the ports 51 and 57 during a large portion of each movement of each piston 55. It is obvious that the pistons or valves 55 close communication between the ports 51 and '57 during certain phases `of operation of the motor. The control valves 15 are, related so that their pistons or valves 55 are horizontal and` therefore in parallelism, and so that their stems 59 project o vso that the port 51 of each valve chest is in communication with a port 57`during approximately 270 of each rotation ofa driving rotor 12 or during the movement of the vane 30 of said rotor from the inlet port`44 of its chamber 11 to the outlet port 44, it being understood that the valves 15 and the valve gear 16 may be set and related to l operate in any desired or specific manner. The control valves l5 are synchronized vby the valve gear 16 toprovide for the proper relation between the .admission and exhaust of the two chambers 11. 1 The valve gear 16 includes like eccentrics 60 on the projecting ends of the driving rotor shafts 23. Eccentric straps 61 are operatedby the eccentrics 60. The eccentric straps 61 have downwardly projecting rods or arms 62. segmental or longitudinally curved reversing links 63 are pivotally mounted below the eccentrics 60 and at points spaced outwardly from the eccentrics. The reversing links 63 have their pivotal mountings 64 at their lower sides and spaced midway' between their opposite ends. In the particular arrangement illustrated in the drawings, the reversing links 63 are arranged with their open or concaved sides facing upwardly. `Each reversing link 63 is provided with a curved longitudinal slot 65. Pivotal connections 66 are provided between the lower ends of the eccentric arms 62 and the inner ends of the reversing links 63.

Radius rods 67 are pivotally and shiftably connected with the reversing links 63. The radius rods 67 extend upwardly from the reversing links 63 and'their lower ends are pivotally connected with blocks 68 zslidable longitudinally in the curved slots of the links. The radius rods 67 are reciprocated or given longitudinal movement due to the rocking of the reversing links 63 Vand the strokes of the radius rods dependl upon of the radius rods 67- is operatively connected to the stern 59 of theuppercontrol valve 15 by a rocker or bell crank having one arm 69 pivotally connected with the upper endof the radius rod and having its other arm 70 pivotally connected with a link 71 attached to the outer end of the valve stem. The other radius rod 67 is operatively connected with the stem 69 ofthe lower control valve 15. Its upper end is pivotally connected with one arm 72 of a rocker or bell crank which has its other arm 73 extending downwardly and outwardly for connection with a transfer link 74. The transfer link 74 extends downwardly and is connected at its lower end to a bell crank or rocker 75. A lever or link 76 is provided on the outer end of the stem 59 of the lower control valve and is pivo-tally connected with the rocker 75. A suitable case or housing 77 is provided on the block 10 tc enclose the valve gear. The valve gear just described is operable to reverse or operate the two control valves 15 to provide for the proper admission and exhaust of steam or fluid from the chambers 11. The various parts of the valve gear 16 are proportioned and related to provide for the desired synchronism of movement of the pistons 55 of the control valves 15.

The valve gear 16 is such that the blocks 68 at the lower ends of the radius rods may be shifted or adjusted along the links 63 to vary the strokes of the radius rods and control valves `l5 and to shift the blocks 68 over the centers of the pivotal axes of the links 63 in order to reverse the relative action of the control valves 15 when the motor is to be reversed. A reversing and controlling lever 8O is pivoted at its lower end to the inner side of the case 77 and projects upwardly through the upper end of the case 77 to have its upper end adjacent the upper end of the lever 55. Reach rods 81 connect the lever 80 with the radius rods 67. The reach rods 81 are pivotally connected at 86a with the lever 80 at points within the case 77 and in the particular structure illustrated, are normally substantially horizontal, their positions of course, depending upon the setting of the radius rods. It will be apparent how shifting of the lever results in adjustment or shifting of the radius rods 67 so that their points of connection with the links 63 are movedfalong the links.

Means is provided for releasably holding or setting the lever 80 in any one of a plurality of different positions. A toothed quadrant 82 is provided on the upper end of the case 77. A shiftable or releasable latch 83 is carried by the lever 80 to cooperate with the teeth of the quadrant. A pivoted handle 84 is provided on the lever 80 to operate or release the latch 83. After the release of the latch 83 the lever 80 may be shifted to vary the strokes of the control valve pistons 55 and thus vary the speed of operation of the motor and may be shifted to move the points of connection of the radius rods with the links 63 between the opposite sides of the pivotal axes of s the links when the motor is to be reversed.

In operation assuming that the reversing valves 14 are set or adjusted to the positions illustrated in Fig. 2 of the drawings, the driving rotors l2 are rotated in the clock-wise direction as indicated by the arrows. The chamber 1l at the right-hand side of Fig. 2 has its upper port 44 in communication with an inlet 51 'and has its lower port 44 in continuous communication with the lower exhaust port 45. The lower port 44 of the chamber 11 at the left hand side of Fig. 2 is .nosa-aie in communication with the inlet port 51 of the lower Valve chest, While the upper port 44 of this chamberl is in constant communication with the upper exhaust port 45. The vane 30 of the right hand rotor 12 illustrated in Fig. 2 of the drawings has just left the groove 34 of the master rotor 13 and is passing over the upper port 44. During this phase of the cycle, the upper control valve l5 closes the port 51. Upon the vane 30 passing the port 44 the control valve 15 may move to the position where its port 58 is in communication with the port 57 and the port 51 so that the actuating steam or iiuid pressure is admitted to the chamber l1 behind the vane 30. This steam or fluid pressure admitted to the chamber 11 acts upon the rear face or side of the vane 30 to drive or rotate the rotor 12. It is to be understood that the lower port 44 of the right hand chamber l1 remains open so that there is no resistance to movement of the vane 30 due to back pressure in the chamber. As the ports 44 are spaced approximately apart and are positioned adjacent the lines of joinder of the bore 18 with the chamber 11, the actuating steam or fluid pressure may be admitted into the chamber l1 during substantially 270 of the cycle or movement of the vane 30, or in other words, until the vane 30 reaches or approaches the lower or exhaust port 44. Where an expansible actuating iiuid such as steam is employed, the control valves 15 may be set to provide for the proper expansion of the steam in the chamber 11 so as to obtain a maximum advantage of the available energy of the actuating pressure. When the vane 30 of the right-hand rotor l2 reaches the lower or exhaust port 44, the control valve l5 may close, or may have been closed for a suitable portion of the cycle of the rotor, and thereafter remains closed until the vane 30 again passes the upper port 44. After the vane passes the lower port 44 it enters or is received by the groove 34 of the master rotor and upon leaving the groove, again passes the upper port 44 whereupon the above described cycle of operation of the rotor is repeated. The cycle of operation of the left hand rotor is repeated. The cycle of operation of the left hand rotor 12 is the same as that just described,.with the exception that the actuating steam or iiuid pressure is admitted into the chamber 11 through the lower port 44 and is exhausted through the upper port 44 which remains open. As the vanes 30 of the two driving rotors l2 are in the same rotative positions, and as the rotors 12 rotate in the same direction at opposite sides of the master rotor 13, the vanes 30 alternately or successively cooperate with the groove 34 of the master rotor at diierent portions of the cycle of the motor, This relation between the vanes 30 provides for the developing or delivering of continuous power as one driving rotor 12 is passing through the active or power portion of its cycle during the time the vane 30 of the other rotor is passing from the exhaust port to the inlet port.

The master rotor 13, in having its periphery in proper timing or synchronism of the rotors 12 and therotor 13;-, ,Thesiroke @movement tithe Control( valves 151mg be readily 'caverne :bv

` In order to reversegthe motor,` the lever 55 is shifted to turn the plugs` 4&1ofthejreversing valves 909 to changeor ref, versethe relationship between the pairs, 1f/portsy melma, ofu the lever` A8 seventy-vcper cent of.` theirl `cycles so thatcthe greater portion. of i the, available `energy of the steam or fluid pressure: is utilized; The motor operates smoothly and with little-ortho vibration, as it does not involve any largefreciprocating parts. It will be understood how the motor is adapted tov be. driven or operated by various classes. of fluid under pressure, and how the motor is capable of being effectively employed in various situations and installations.

Having described only a typical form and aptplication of our invention, we do not wish to be limited or restricted to the specific form or application herein set forth, but wish to reserve to ourselves any modifications or variations that may appear to those skilled in the art or fall with- ,in the scope of the following claims:

Having described our invention, we claim:

1. In a uid motor, a body having two spaced openings and a third opening joining said spaced openingsrotors in said spaced openings, a vane on each rotor adapted to be acted upon by uid pressure admitted to the opening, a cylindrical member rotatable in the third opening, the periphery of said member having rolling contact with the peripheries of the rotors and having a `groove for receiving said vanes, the body having two ports communicating with one of said openings, and two ports communicating with the other opening, valve chests at opposite sides of the body each having a iluid pressure supply and an oexhaust, one of said ports from each of said openings being continuously open to one of the exhausts, valves in the chests governing the admission of iluid to the other of said ports, mechanical means actuating the valves, and a posi- 'tive operative connection between the rotors and the said member.

2. A motor including, a body having two spaced openings and a bore having a longitudinal axis parallelwith the axes of said openings, the bore joining said openings, rotors in said openings, a vane on each rotor adapted to be acted upon by iluid pressure, a member rotatable in said bore vand having its periphery in contact with the peripheries of the rotors, there being a groove in fthe member for receiving the vanes, the body having two ports communicating with each of said openings, spaced exhaust ports, and spaced inlet ports, reversing valves for putting each of uthe first mentioned parts incommunication with `the exhaust ports and inlet ports, control valves `for the inlet ports, a valve gear for operating the control valves, and a driving connection between the rotors and said member.

3. A motor including, a body having two spaced parallel withgthe` axes of said openings, the` bore joining said openings, rotors ,in` said openings, a vaneon ,each rotorl adaptedto beacted upon by uidi pressure, a member` rotatable, in saidbore and having its periphery in,` contact with the peripheries of the, rotors, there being va groove in the member `for receiving the vanes, the body having two ports communicatingv with each of said openingaspaced exhaust ports, and spaced inletports, reversingvalves: forputting each of` the rst mentioned ports in communication with the exhaust ports and inletports,control valves forthe inlet` ports, a variable and reversible valve gear forzoperating the control valves, and a drivingconnection between the rotors and said member.

openings andga` bore having a longitudinal axis parallel with the axes osaid openings, the bore joining said openings,rotors in said openings, a

openings andyaborehaving a longitudinal axis'V 4. A motorincluding, a body having two spaced -so y vane on each1rotor having fsliding engagement with a'wall of an opening, a member rotatable in.

openings, a vane on each rotor, a cylindrical member rotatable in 4the central opening and having its periphery in engagement with the peripheries of the rotors, there beinga groove in the member for receiving the vanes, there being spaced ports in the body communicating with each of the first mentioned openings adjacent their points of joinder with the central opening, one port from each of said openings being continuously open tothe exterior of the body to exhaust, mechanically actuated control valves governing the admission of uid pressure to the other ports, and a driving connection between the rotors and said member.

6. A motor of the character described including, a body having a central bore, an opening parallel with and joining the central bore, andv a second opening parallel with and joining the central bore, rotors in the rst and second openings, a vane on each rotor, a member rotatable in the central bore and engaging the rotors, the member having a groove for receiving the varies, spaced valve chests, each having an inlet and an exhaust, the body having two ports communicating with the rst opening, one port extending to one chest, the other to the other chest, and having two ports communicating with the second opening, one port extending to one chest, the other port extending to the other chest, a reversing valve in each chest operable between a position where it connects one of the ports communicating with the chest with an inlet and connects the other port communicating with the chest with an exhaust and a position where the relation of the ports with the inlet and exhaust are reversed, control valves governing the inlets, reversing gear operating the control valves, and a drive between the rotors and said member. i

7. Amotor of the character described including, a body having a central bore, an opening parallel with and joining the centralbore, and a second opening parallel with and joining the central bore, rotors in the rst and second openings, a vane on each rotor, a member rotatable in the central bore and engaging the rotors, the member having a groove for receiving the vanes, spaced valve chests, each having an inlet and an exhaust, the body having two ports communicating with the rst opening, one port extending to oneI chest the other to the other chest, and having two ports communicating with the second opening, one port extending to one chest the other port extending to the other chest, a, reversing Valve in each chest operable between a position where it connects one of the ports communicating with the chest with an inlet and connects the other port communicating with the chest with an exhaust and a position where the relation of the ports with the inlet and exhaust are reversed, an inter-connection between the reversing valves whereby they may be simultaneously reversed, control valves governing the nlets, reversing gear operating the control valves, and a drive between the rotors and said member.

8. A motor of the character described including,

abody having a central bore, an opening parallel with and joining the central bore, and a second opening parallel with and joining the central bore, `rotors in the rst and second openings, a vane on each rotor, a member rotatable in the central bore and engaging the rotors, the member 4having a groove for receiving the Vanes, spaced valve chests, each having an inlet and an exhaust, the body having two ports communicating with the rst opening, one port extending to one chest the other to the other chest, and having two ports communicating with the second opening, one port extending to one chest the other port extending to the other chest, a reversing valve in each chest operable between a position where it connects one of the ports communicating with the chest with an inlet and connects the other port communicating with the chest with an exhaust and a position where the relation of the ports with .the inlet and exhaust are reversed, control valves governing the inlets, reversible Valve gear operating the valves, and a timing connection between the rotors and said member.

SAMUEL C. CARTER. FRANK H. METKE. 

